Method of coating porous ceramic structures with .gamma.-alumina

Details Method of coating porous ceramic structures with .gamma.-alumina Method of coating porous ceramic structures with .gamma.-alumina

1987-07-13

1988-05-24

Childs, Sadie L.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427180, 427181, 427199, 427230, 4273762, B05D 306, B05D 722

Patent

active

047465379

ABSTRACT:
A method of applying .gamma.-alumina to a porous ceramics structure includes the steps of: causing fine particles of .gamma.-alumina together with a carrier gas to flow through pores in the porous ceramics structure so as to deposit the .gamma.-alumina fine particles on the surfaces of the skeleton of the porous ceramics structure, and heating the structure with the .gamma.-aluminum particles deposited thereto to a predetermined temperature thereby fixing the .gamma.-alumina particles. The fine particles of .gamma.-alumina are formed by causing an arc discharge between the surface of molten aluminum and an aluminum electrode so as to generate vapor of aluminum, and oxidizing the aluminum vapor by an oxidizing gas which may be Ar-O.sub.2 carrier gas which is made to flow through the pores in the porous ceramics structure.

REFERENCES:
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patent: 3635759 (1972-01-01), Howatt
patent: 3925177 (1975-12-01), Kofoid
patent: 3926702 (1975-12-01), Oki et al.
patent: 3931050 (1976-01-01), Asano et al.
patent: 4204011 (1980-05-01), Tanabe et al.
patent: 4264346 (1981-04-01), Mann
patent: 4312899 (1982-01-01), Lahmann

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